Discover how the FLNG market designs and operates complex topside processing trains that remove impurities, dry the gas, and chill it to cryogenic temperatures, all on a moving vessel.

An FLNG vessel is not a simple barge; it is a floating factory. The FLNG market provides vessels that integrate gas reception, slug catching (managing liquid slugs from the pipeline), separation (gas, oil, water), gas treatment (amine for CO₂ removal, molecular sieves for water removal), mercury removal, liquefaction (using mixed refrigerant or cascade cycles), fractionation (separating natural gas liquids), and storage. For a vessel with an associated gas field (gas produced with oil), the FLNG may also include oil processing and storage. The topside layout must be compact to fit on a ship-shaped hull, with equipment arranged to minimize piping runs and to maintain stability. Safety systems are extensive: fire and gas detection, deluge, blast walls, and emergency shutdown (ESD). For a crew of many people living onboard for weeks at a time, accommodation and life support are provided.

The technology of liquefaction at sea has evolved to be more robust and tolerant of motion. The FLNG market offers vessels with column-less heat exchangers (e.g., spiral-wound or plate-fin) that are less sensitive to tilt and wave-induced motion. Compressors are mounted on anti-vibration mounts and often use magnetic bearings to reduce maintenance. Gas turbines for power generation (or drive of compressors) are housed in acoustic enclosures and fed by treated fuel gas. For a vessel operating in a warm climate, seawater cooling is used for the refrigerant condensers. For a vessel in a cyclone-prone region, the topside structure must withstand high winds and waves, with helidecks and lifeboats designed for emergency evacuation. The flare system (for burning off gas during startup or upsets) is typically on a separate tower or located to minimize heat radiation to the vessel.

Pairing the FLNG market with the offshore LNG market highlights the broader ecosystem. The offshore LNG market includes not only FLNG but also floating storage and regasification units (FSRUs) and conventional LNG carriers. For a country importing LNG, an FSRU receives and regasifies the LNG for pipeline distribution. For a remote power plant, a small-scale FLNG unit could supply LNG directly. For an FLNG vessel, the offtake LNG carriers must be able to moor safely alongside or in tandem, often in open sea conditions, using dynamic positioning or tug assistance. As the FLNG market matures, designs are becoming more standardized, reducing engineering costs and construction schedules. The FLNG market will continue to advance, with digital twins, remote monitoring, and automation reducing the need for onboard personnel and improving safety.

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